Stuart Snyder to president-chief operating officer, Feld Entertainment, Vienna, Va., from general manager, Turner Home Entertainment, a unit eliminated due to the Time Warner merger.

John F. Smith, 45, to general manager, Cadillac Motor Car Division, Warren, Mich., from president of GM's Allison Transmission Division. He succeeds John Grettenberger, 59, who is retiring.

Paul Goldsmith to president, Franklin Spier, New York, from president, Goldsmith & Associates. He succeeds Len Fogge, who left last spring to become exec VP-creative and marketing services, Showtime Network.

Edward Leonard to VP-marketing, Six Flags Great America's new Midwest Division, Gurnee, Ill., from VP-marketing, Six Flags St. Louis. Also: Todd Goodrich to director of advertising and promotions for the division from the same post at Six Flags St. Louis.

Brad Most to VP-management supervisor on the H&R Block account, Young & Rubicam, Chicago, from VP.